Interesting--thanks for posting. I remember reading (I think) that Compean said something like "it was reflex"... or habit... and that it was his common practice when at the shooting range to pick up his spent casings. It is also interesting to note that after 5 years on the job, Compean had never shot at anyone before this incident.
I tried to find where I read that, to no avail.
We will just have to keep digging for nuggets of fact among all the BS.
For the life of me, I can't understand why the President is dragging his feet in pardoning these guys, knowing just as well as we do, the danger they are in.